diff --git a/defaults/solr.keys.list b/defaults/solr.keys.list
index 318d4c733..32888e9c2 100644
--- a/defaults/solr.keys.list
+++ b/defaults/solr.keys.list
@@ -66,7 +66,7 @@ httpstatus_i
 references_i
 
 ## depth of web page according to number of clicks from the 'main' page, which is the page that appears if only the host is entered as url
-#clickdepth_i
+clickdepth_i
 
 ## needed (post-)processing steps on this metadata set
 process_sxt